Solve the Equation and Express the Solution in Exact Form $$\log _ { 4 } ( x + 7 ) + \log _ { 4 } ( x - 7 ) = 1$$

Multiple Choice

Solve the equation and express the solution in exact form.
- $$\log _ { 4 } ( x + 7 ) + \log _ { 4 } ( x - 7 ) = 1$$

A) $\{ 53 \}$
B) $\left\{ \frac { 197 } { 4 } \right\}$
C) $\{ \sqrt { 53 } \}$
D) $\{ 4 \}$